Add the new wiremix icon if there isn't already a wiremix config

migrations/1769964367.sh

@@ -0,0 +1,6 @@
+echo "Improve audio controls icon for default selection"
+
+if [[ ! -f ~/.config/wiremix/wiremix.toml ]]; then
+  mkdir -p ~/.config/wiremix
+  cp -f $OMARCHY_PATH/config/wiremix/wiremix.toml ~/.config/wiremix/
+fi